import { Readable } from "stream";
import { timing } from "./timing";
const MIN_WAIT_TIME = 6_000;
export async function writeRequestBody(httpRequest, request, maxContinueTimeoutMs = MIN_WAIT_TIME, externalAgent = false) {
    const headers = request.headers ?? {};
    const expect = headers.Expect || headers.expect;
    let timeoutId = -1;
    let sendBody = true;
    if (!externalAgent && expect === "100-continue") {
        sendBody = await Promise.race([
            new Promise((resolve) => {
                timeoutId = Number(timing.setTimeout(() => resolve(true), Math.max(MIN_WAIT_TIME, maxContinueTimeoutMs)));
            }),
            new Promise((resolve) => {
                httpRequest.on("continue", () => {
                    timing.clearTimeout(timeoutId);
                    resolve(true);
                });
                httpRequest.on("response", () => {
                    timing.clearTimeout(timeoutId);
                    resolve(false);
                });
                httpRequest.on("error", () => {
                    timing.clearTimeout(timeoutId);
                    resolve(false);
                });
            }),
        ]);
    }
    if (sendBody) {
        writeBody(httpRequest, request.body);
    }
}
function writeBody(httpRequest, body) {
    if (body instanceof Readable) {
        body.pipe(httpRequest);
        return;
    }
    if (body) {
        const isBuffer = Buffer.isBuffer(body);
        const isString = typeof body === "string";
        if (isBuffer || isString) {
            if (isBuffer && body.byteLength === 0) {
                httpRequest.end();
            }
            else {
                httpRequest.end(body);
            }
            return;
        }
        const uint8 = body;
        if (typeof uint8 === "object" &&
            uint8.buffer &&
            typeof uint8.byteOffset === "number" &&
            typeof uint8.byteLength === "number") {
            httpRequest.end(Buffer.from(uint8.buffer, uint8.byteOffset, uint8.byteLength));
            return;
        }
        httpRequest.end(Buffer.from(body));
        return;
    }
    httpRequest.end();
}
